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- Multiple ChoicePlease save your changes before editing any questions.
What does catalyst do to a reaction?
Slows down the reaction
Nothing changes
Speeds up the reaction
- Multiple ChoicePlease save your changes before editing any questions.
What do you call the energy that is required to start a reaction?
Alternative energy
Activation energy
Atmospheric energy
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Which of the reaction pathway shows the catalysed reaction?
1
2
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What happen to the rate of reaction when a catalyst is added to it?
Increases
Decreases
Nothing changes
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Catalysts may be in the state of ___________.
Solid and liquid only
Liquid and gases only
Solid and gases only
Solid, liquid or gases
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How does a catalyst work in speeding up a reaction?
By lowering the activation energy or reaction
by making them more available
by giving them more energy
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The following graph shows two different reaction pathways for the same overall reaction at the same temperature. Which pathway is slower and why?
Red, because the activation energy is larger
Blue, because the activation energy is lower
both reaction progress at the same rate
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A ______________ is a substance that increases the rate of a reaction without being used up during the reaction.
catalyst
reactant
product
solute
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A catalyst increases the efficiency of collisions between reactants.
true
false
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What is the name given to a catalyst in the human body?
Biology
Chemical
Enzyme
Catalyst
- Multiple ChoicePlease save your changes before editing any questions.
Most enzymes are composed of .....
Lipids
Proteins
Carbohydrates
Nucleic Acids
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Enzymes in your body probably work best at which of the following temperatures>
25oC
37oC
98oC
100oC
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What is the purpose of an enzyme?
give permission for the reaction
speed up reactions
raise activation energy
control how many reactions occur
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What is another name for enzymes?
chemical catalysts
biological catalysts
microorganisms
inorganic catalysts
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What catalyst is used for hydrogen peroxide?
enzyme and magnesium dioxide
magnesium dioxide
enzyme